Searchlight



Feb. 20, 1923 D. FOSTER ET AL.

SEARGHLIGHT.

Aman FEB. zo. 1920.

f alla v. mmf/M WM T0106 R mf m M w Patented Feb. 20, 1923.

UNITED STATES 1,446,248 Parar ortica.

SEARCHLIGHT.

Application filed February 2Q, 1920. Serial No. 360,213.

To @ZZ wlw/1n t may concern.' l

Be it known that we, DoNovAN- Fosrur. and LEROY L. MIDDELKAMP, citizensof the United States, residing at Seattle, in the county of King andState of Washington, have invented certain new and useful lmprovementsin Searchlights, of which the following is a specification.

This invention relates to search-lights and more especially to apparatusof this character which are employed upon pilot-houses of marine vesselsto facilitate making landings at docks, etc.

rlhe object of our invention is the provision of a search-light providedwith devices to enable the search-light to produce selectively aconcentrated beam or a diverging beam through the instrumentality vofmeans which are manually actuated as, for ex7 ample, from the interiorof a pilot house.

The invention consists in the novel construction and combination ofdevices for regulating the position of the source of light with respectto the lens of a searchlight.

1n the accompanying drawing,

Figure 1 is a longitudinal vertical elevation of asearch-light embodyingthe present invention shown applied.

Fig. 2 is a transverse vertical sectional view through 2--2 of Fig. 1.Fig. 3 is a horizontal sectional view through the lamp casing shown inthe preceding views, the light bulb being omitted.

Fig. 4 is a detail sectional view through t-t of Fig. 1.

Referring to the drawings, 5 is the casing of a search-light provided atits front with converging lens 6.

The rear end 7 of the casing is made re-` movable to afford access tothe interior'. tending from diametrically opposite sides of the casingare trunnions 8 which are journaled in bearings providedr in thebifurcations 9 of a vertical post 10 which is supported by and rotatablein a hollow stand 11 which is secured to a pilot house roof which isindicated by 12.

Secured to the trunnions 8 are forwardly extending arms 13 which areconnected to the branches 14 of a forked member l5 which, in turn, isconnected to an arm 16 of a tubular controlling rod 17 which extendsdownwardly through the stand 11 into thepilot house. 18 represents ahand wheel provided on the lower` end of the rod 17 whereby the lattermay be rotated by the pilot to correspondingly turn the search-light.Said wheel is also utilized to elevate or lower the rod 17 which, actingthroughthe medium of member 15 and arms 13, serve to regulate the casingaxis with respect to a. horizontal plane.

The above described devices have beenk is journaled at its ends in thebloc-ks 23 and engages in a nut 241 depending from the carriage so thatwhen the screw is turned in one rotary direction or the other thecarriage is `respectively advanced toward or retracted from the front ofthe casing.

To effect such rotary movements of the carriage actuating screw wepreferably use two cords and 26 wound in reverse directions about thescrew and thence extending through the controlling rod 17 into the pilothouse as at 251 and 261.

For convenienceof the operator in selectively using said cords the sainehave desirably attached thereto, diiferentshaped bodies as, for example,a cube 252 and ball 262 tobe readily distinguishable in the dark bytouch.

27 represents an incandescent lamp bulb having circuit wires 28extending as through the'rod 17 to a source of electric energy.

For the purpose of regulating the source of light to be located in thefocal axis of the lens the lamp bulb is adjustable vertically as bymeans of a wedge .or cam shaped socket 30 and a flanged ring 31surrounding the socket extension 301 and secured to the carriage. f

32 represents a reflector' disposed to the rear of the source of lightand is connected to a standard 33 which, in turn, is con nected forhorizontal adjustments to a bracket arm 34: arranged for vertical androtary movements upon a post 35 which is secured to the rear end of thecarriage.

The rear end of the casing is removed for regulating` the relativepositions or", the lamp bulb and the reflector.

To effectthe coincident movements or the lamp bulb and the reflectortoward or from the lens 6 the operator exercises a pull upon the cordends Q51 or 9.6"A which will suitably rotate the screw 24 to impart thedesired movement to the carriage upon which the bulb zand reflector aremounted. y y

VhenV the source of light as represented by the filament A is inapproximately the position in which it is illustrated by full lines in F1, the light rays which are effective with respect to the lens, will bewithin the angle between the dotted lines a, a and such rays passingvthrough the lens are delivered` in a concentrated beam included between`the dotted linesol, @5.1.

By advancing the carriage toward the lens,rhowever, to position thesource of light at B, 'for example, the eifective light` rays, withrespect to the lens, will be within the angle of the dotted lines Z), 7)and which in passing` through the lens are retracted to extend asdenoted by b1, b1 outside of the referred to concentrated beam with adiverging beam.

That we claim, is-

ln a searchlight, the combination with a casing having` a lens` at thefront end thereoli, a stationary stand, a hollow postinounted in saidstand and serving as a support for the casing, said post serving, as averticaly pivot for the casing, and horizontal pivot connections for thecasing,` carried by said post, of a carriage provided .in the casing,`for longitudinal movements relative thereto, an electric lamp and areflector mounted on said carriage, devices provided in the casing,` andoperatively connected with said carriage for effecting travel to thelatter, means extending; through said post for rotatably moving` saidcasing` about the axes of both the vertical and horizontal pivotconnections therefor, and means extending through said post foractuating said devices to cause the carriage to convey the lamp andreflector toward or Jfrom said lens.

Signed at Seattle, Vilashington, this 11th day et February, 1920.

DONOVAN FOSTER. l LEROY L. MIDDELKABHD. vlfllitnesse.

' Pinnen BARNES,

y llLi'zfmnfrn JOHNSON.

